Why haven't the media scrutinized Obama?

Charles Krauthammer in a Washington Post article writes that the New Hampshire win by Clinton was a good thing. Obama up to now gets to smile and charm, and no one asks any tough questions:

The freest of all passes to Obama is the general neglect of the obvious central contradiction of his candidacy: The bipartisan uniter who would bring us together by transcending ideology is at every turn on every policy an unwavering, down-the-line, unreconstructed, uninteresting, liberal Democrat. . .

Special interests? Obama is a champion of the Davis-Bacon Act, an egregious gift to Big Labor that makes every federal public-works project more costly. He not only vows to defend it but proposes extending it to artificially raise wages for any guest worker program.

On Iraq, of course he denigrates the surge. That's required of Democratic candidates. But he further claims that the Sunnis turned against al-Qaeda and joined us -- get this -- because of the Democratic victory in the 2006 midterm elections. . .

Even if you believe that a Clinton restoration would be a disaster, you should still be grateful for New Hampshire. National swoons, like national hysterias, obliterate thought. The New Hampshire surprise has at least temporarily broken the spell. Maybe now someone will lift the curtain and subject our newest man from hope to the scrutiny that every candidate deserves."